last information that i've forgotten, the video path contain a "é".
But I've to repeat that when I select the path with the option "ask user" it works well, only the option "Same folder as video file" raises the error.

As I don't have the history of the project, I don't know why this line commented/uncommented, but the bug is maybe because the program tries to decode the filesystem as utf-8 instead of iso 8859-1 (for me).

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The original patch (by Ludovic) that got applied does not fix the core of the problem, which is cause by calling .decode() on that string. On my French system:

>>> print sys.getfilesystemencoding()
UTF-8

So replacing decode('utf8') by decode(sys.getfilesystemencoding()) doesn't do anything useful.

I've attached a new patch to bug #913453 that removes the whole decode() part, and now subtitles can be properly downloaded to folders containing accents. When the patch is applied, both issues can be closed.